Recording tape cartridge

Abstract

Sliding resistance at a time when a locking member is moved between a locking position and an unlocking position with respect to a reel can be lessened, and deformation of a flange welded to a hub also can be suppressed. In a recording tape cartridge 10 in which a reel 20 , at which an upper flange 24 is welded to a hub 22 , is singly and rotatably accommodated within a case 12 , a locking member 70 is configured to be able to rotate within a plane orthogonal to a rotation axis direction of the reel 20 around a position which is different from a rotational center of the reel 20 . The locking member 70 is set at a locking position, at which the locking member 70 is interposed on an extended line of the hub 22 in the rotation axis direction at a side where the upper flange 24 is welded and the locking member 70 impedes movement of the reel 20 in the rotation axis direction, and an unlocking position, at which the locking member 70 is withdrawn from the extended line of the hub 22 in the rotation axis direction at the side where the upper flange 24 is welded and the locking member 70 permits movement of the reel 20 in the rotation axis direction.

1. A recording tape cartridge comprising:
 a reel having a hub on which a recording tape is wound, and flanges holding the recording tape wound on the hub, at least one of the flanges being welded to the hub; 
 a case accommodating the reel singly and rotatably; and 
 a locking member configured to be able to pivot within a plane which is orthogonal to a rotation axis direction of the reel around a position which is different from a rotational center of the reel, the locking member being set at a locking position, at which the locking member is interposed on an extended line of the hub in the rotation axis direction at a side where the flange is welded and the locking member impedes movement of the reel in the rotation axis direction, and an unlocking position, at which the locking member is withdrawn from the extended line of the hub in the rotation axis direction at the side where the flange is welded and the locking member permits movement of the reel in the rotation axis direction. 
 
   
   
     2. The recording tape cartridge of  claim 1 , wherein the locking member is configured to be interposed, from an inner peripheral surface side of the hub, on the extended line of the hub in the rotation axis direction, and does not go beyond an outer peripheral surface of the hub in plan view. 
   
   
     3. The recording tape cartridge of  claim 1 , wherein the flange which is welded to the hub has an extended portion which engages with an inner peripheral surface of the hub. 
   
   
     4. The recording tape cartridge of  claim 1 , wherein an engaging surface, which has a substantially similar curvature as a peripheral surface of the hub, is formed at a distal end portion of the locking member which is interposed on the extended line of the hub in the rotation axis direction, and a distance to be moved by the locking member between the locking position and the unlocking position is shortened. 
   
   
     5. The recording tape cartridge of  claim 1 , wherein the locking member is pivoted by a moving member which moves in the rotation axis direction of the reel, the moving member is urged toward a floor wall of the reel by a second urging member, and the moving member and the second urging member are provided at an inner peripheral side of the locking member in a radial direction of the reel.